Fuse.



J. W. HOOLEY.

FUSE. AIPPLIOATION rum) In 1, 1913.

Patented Sept. 30, 1913.

nvmvron Job/7 W fiao/ey ATTORNEYS WITNESSES 'ment of.--ii1y invention; Fig.

UNITED snares PATENT OFFICE.

JOHN W. HOOLEY, OF NEW YORK, N. Y.

rose.

To all whom it may concern:

Be it known that I, J orm W. HOOLEY, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, haveinv'ented a new and Improved Fuse, of which the following is a full, clear, and exact description.

y refillable, inclosed fuses, and has reference more particularly to the class comprising a fusing member secured to members removably associated with a transparent shell inclosing the fusing member and through which the, condition of the fusing member can be seen at a glance without disturbing any part of the fuse. v

Among the objects of the invention are: to provide an inexpensive, simple and durable refillable, inclosed fuse, the fusing member of which can be easily and quickly replaced when the same is blown out; which tfords instant detection of a blow-out in a fuse; and which prevents the substitution of a fusingmember of a different carrying current capacity than the one for which the fuse is designed. asthe. fusing member can be seen through the transparent shell of the fuse.

The invention consists of the construction and combination of parts to be more fully described hereinafter and fully set forth in the claims.

Reference is to be had to the accompanying drawings forming apart of this specification, in which like characters indicate corresponding parts in all the Views and in which:

Figure 1 is an elevation of an embodi- 2 is a section on liIi'e"2-2, Fig. 1; Fig. 3 is a transverse section on. line 3-3, Fig. 2; and Fig. 4 is a similar section on line Fig. 2.

Referring to the drawings, 5 represents a shell made of transparent material, preferably glass, exteriorly threaded at both ends and having a central axial bore 6 of angular cross section. The end- 7 of the bore is slightly enlarged andis prismatic in form, while the opposite end 8 of the bore forms a frustum of a pyramid. The purpose of this will appear hereinafter. Fitting snugly into the end 7 of the bore is a plug 9, the collar 10 of which abuts against the end of the shell. The plug 9 is also provided with a blade portion 11 substantially Specification of Letters latent.

invention relates to fuses known as' her 19 by means of Patented'Sept. 30, 1913.

Application filed Kay 7, 1913. Serial No. 766,007.

in alinement with the axis of the shell and projecting away from the shell and integral with the collar portion 11 of the plug. 9 is a threaded cap 2 by means of which the plug 9 is secured to the shell 5. The end 8 of the bore receives a plug l3'having the shape of a frustum of a pyramid and provided at its smaller base with a threaded portion 14: projecting out of the end S of the bore. Engaging the threaded portion 1 1 of the plug 13 is a blade portion 15 provided with a flange 16 which is centrally threaded to the portion 14, with the flange 16 abutting against the .end of the shell 5, thereby wedging the plug 13 in the end Fitting ion the blade portion 15 is a threaded cap 17 similar to cap 1.2 and whereby the flange 16 is forced against the end of the shell 5. The plugs 9 and 13 are each provided with a lug 18 to which is secured a fusing memscrews 20, or any other suitable means.

The plugs 9 and 13, also the blade portion 15, are preferably made of highly electrical 10. Fitting on the blade conductive material, such as copper, for eX- v ample. The caps 12 and 17 can be made of material which will conduct electricity or of insulating" material.

The advantage of my fuse is that a blowout can be instantly percehed through the shell 5, which is a particular advantage where a number of fuses are used on the same board; and there is no necessity for taking the fuses apart to find out which has blown out, as the same is seen through the transparent shell 5. The blown-out fuse can be easily replaced as follows: The fuse is removed from the board by disengaging the blades 11 and 15 from the contacts. The cap 17 is screwed off, then the blade portion 15 is removed from the plug 13, which is allowed to fall into the bore 6; the cap 12 is then removed from the shell and the plug 9 taken out. This allows the plug 13 to fall out. of the bore. A new fuse member 19 is then attached to the lugs 18 of the plugs 9 and 13. The so-connected plugs 13 and 9 are then passed into the bore 6 through the end 7 with the plug 18 leading the way, until the plug 13 engages the end 8 and the threaded end 14 projects out of the bore. The cap 12 is then screwed into place, thereby forcing the plug 9 into position and making it rigid with the shell 5. The blade 15 with the flange- 16 is then secured to the It is understood that, if desired, the bore 6 and the end 7 of the bore can be circular.

A further advantage of my fuse is that the fuse cannot be refilled with a fuse member of a higher carrying capacity than the one prescribed by the underwriters, as the same could be, easily seen by-t-he inspector through the shell. The substitution of a fuse member of a higher current capacity is very often resorted to to prevent blowouts in the refillable fuses in shells which are not transparent, and cannot be detected bv the inspector. Therefore, most of the refillable fuses, are forbidden by the underwriters rules, as the shell must be removed to see if the fuse contains the right fuse member.

Having thus described my invention, What I claim as new and desire to secure by Lety ters Patent is:

1. In a fuse, a glass shell having threaded ends and an axial bore of angular cross section, one end of said bore being of prismatic shape, onverging toward the end of the shell; p ugs fitting snugly in the ends of said bores and having knife portions projecting away from said shell; caps threaded to the ends of said shell and. engaging said plugs and thereby securing the same to said shell; a fusing member in said bore and'removably associated with said plugs, said fusing member being visible through said shell.

2. In a fuse, a glass shell having threaded ends and an axial bore of angular cross section, one end of said bore being prismatic in form and converging toward the adjacent end of the shell, the opposite end of the bore being slightly enlarged; a plug in the enlarged end of the bore having a collar abutting against the structure of theshell and a blade portion projecting away from the shell; a threaded cap secured to the threaded end of the plug and forcing the collar against the structure of the shell, thereby securing said plug to said shell; a prismatic plug fitting snugly into the prismatic end of the bore; a blade portion provided with a flange secured to said second plug and wedging the said plug in the end of the bore; and a second cap engaging the other thread ed end of the shell and forcing portion of the said blade portion against the adjacent end of the shell and thereby securing same rigidly to said shell; lugs on said plugs in said bore; and a fusible member removably associated with said lugs and normally visible through said shell.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN W. HOOLEY.

Witnesses:

BENEDICT J OFF, PHILIP D.'ROLLHAUS.

said flange 

